Aside from the total capitulation of the core of the business to Microsoft, Yahoo's fate appears to be sealed by the fact that they Just Don't Get It.

Take this impertinent quiz forced onto unwilling Yahoo! Mail users. It asks a bunch of personal questions so that someone can get into the e-mail account. Excuse me, but isn't that what the password is for? What if somebody doesn't want to allow this backdoor method of access to their email account? After all, it has been exploited against people before (notably including Sarah Palin). Why should anyone be FORCED to allow social-engineering attacks against the security of their private data? And why, oh why do you pester and bully people who obviously DO NOT WANT this mis-feature by redirecting them instead of just letting them log in and go about their business? (With all the screwups in your "New, Improved" mail system, you'd think you had better things to do.)

Look, Yahoo!, I'm not asking for much. All I want is for you to take this thing and NOT ASK ME ABOUT IT AGAIN. If I want the "feature", you can put it someplace where I can find it. Just let me log in on the first attempt and quit the bullying to answer personal questions you have no business asking, or I may be forced to take out an address someplace else.